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Subject[patch 33/61] lock validator: disable NMI watchdog if CONFIG_LOCKDEP
From: Ingo Molnar <mingo@elte.hu>

The NMI watchdog uses spinlocks (notifier chains, etc.),
so it's not lockdep-safe at the moment.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
---
arch/x86_64/kernel/nmi.c | 12 ++++++++++++
1 file changed, 12 insertions(+)

Index: linux/arch/x86_64/kernel/nmi.c
===================================================================
--- linux.orig/arch/x86_64/kernel/nmi.c
+++ linux/arch/x86_64/kernel/nmi.c
@@ -205,6 +205,18 @@ int __init check_nmi_watchdog (void)
int *counts;
int cpu;

+#ifdef CONFIG_LOCKDEP
+ /*
+ * The NMI watchdog uses spinlocks (notifier chains, etc.),
+ * so it's not lockdep-safe:
+ */
+ nmi_watchdog = 0;
+ for_each_online_cpu(cpu)
+ per_cpu(nmi_watchdog_ctlblk.enabled, cpu) = 0;
+
+ printk("lockdep: disabled NMI watchdog.\n");
+ return 0;
+#endif
if ((nmi_watchdog == NMI_NONE) || (nmi_watchdog == NMI_DEFAULT))
return 0;

-
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